Spin-controlled topological phase transition in non-Euclidean space.

IF 4.1 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Frontiers of Optoelectronics Pub Date : 2024-03-19 DOI:10.1007/s12200-024-00110-w
Zhuochen Du, Jinze Gao, Qiuchen Yan, Cuicui Lu, Xiaoyong Hu, Qihuang Gong
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Abstract

Modulation of topological phase transition has been pursued by researchers in both condensed matter and optics research fields, and has been realized in Euclidean systems, such as topological photonic crystals, topological metamaterials, and coupled resonator arrays. However, the spin-controlled topological phase transition in non-Euclidean space has not yet been explored. Here, we propose a non-Euclidean configuration based on Möbius rings, and we demonstrate the spin-controlled transition between the topological edge state and the bulk state. The Möbius ring, which is designed to have an 8π period, has a square cross section at the twist beginning and the length/width evolves adiabatically along the loop, accompanied by conversion from transverse electric to transverse magnetic modes resulting from the spin-locked effect. The 8π period Möbius rings are used to construct Su-Schrieffer-Heeger configuration, and the configuration can support the topological edge states excited by circularly polarized light, and meanwhile a transition from the topological edge state to the bulk state can be realized by controlling circular polarization. In addition, the spin-controlled topological phase transition in non-Euclidean space is feasible for both Hermitian and non-Hermitian cases in 2D systems. This work provides a new degree of polarization to control topological photonic states based on the spin of Möbius rings and opens a way to tune the topological phase in non-Euclidean space.

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非欧几里得空间中的自旋控制拓扑相变。
凝聚态和光学研究领域的研究人员一直在追求拓扑相变的调制,并已在欧几里得系统中实现,如拓扑光子晶体、拓扑超材料和耦合谐振器阵列。然而,在非欧几里得空间中的自旋控制拓扑相变尚未被探索。在这里,我们提出了一种基于莫比乌斯环的非欧几里得构型,并演示了拓扑边缘态和体态之间的自旋控制转换。莫比乌斯环被设计成具有 8π 周期,在扭转起始处具有正方形横截面,其长度/宽度沿环路绝热演化,并伴随着自旋锁定效应产生的横向电模式向横向磁模式的转换。利用 8π 周期的莫比乌斯环构建苏-施里弗-黑格尔构型,该构型可支持圆偏振光激发的拓扑边缘态,同时可通过控制圆偏振实现拓扑边缘态向体态的过渡。此外,自旋控制的非欧几里得空间拓扑相变在二维系统中的赫米特和非赫米特情况下都是可行的。这项工作为基于莫比乌斯环的自旋控制拓扑光子态提供了一种新的极化程度,并开辟了一条在非欧几里得空间调节拓扑相位的途径。
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来源期刊
Frontiers of Optoelectronics
Frontiers of Optoelectronics ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
7.80
自引率
0.00%
发文量
583
期刊介绍: Frontiers of Optoelectronics seeks to provide a multidisciplinary forum for a broad mix of peer-reviewed academic papers in order to promote rapid communication and exchange between researchers in China and abroad. It introduces and reflects significant achievements being made in the field of photonics or optoelectronics. The topics include, but are not limited to, semiconductor optoelectronics, nano-photonics, information photonics, energy photonics, ultrafast photonics, biomedical photonics, nonlinear photonics, fiber optics, laser and terahertz technology and intelligent photonics. The journal publishes reviews, research articles, letters, comments, special issues and so on. Frontiers of Optoelectronics especially encourages papers from new emerging and multidisciplinary areas, papers reflecting the international trends of research and development, and on special topics reporting progress made in the field of optoelectronics. All published papers will reflect the original thoughts of researchers and practitioners on basic theories, design and new technology in optoelectronics. Frontiers of Optoelectronics is strictly peer-reviewed and only accepts original submissions in English. It is a fully OA journal and the APCs are covered by Higher Education Press and Huazhong University of Science and Technology. ● Presents the latest developments in optoelectronics and optics ● Emphasizes the latest developments of new optoelectronic materials, devices, systems and applications ● Covers industrial photonics, information photonics, biomedical photonics, energy photonics, laser and terahertz technology, and more
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